San Francisco Bay Area Estate, Antique & Designer RingsShopping for a diamond ring online? Maybe you’re considering purchasing a ruby ring online, a sapphire ring online, or a three stone ring online? At 66mint, we have a large variety of diamond rings for sale online and at our private San Francisco jewelry store. We specialize in estate diamond rings online, engagement rings for sale online, art deco rings, vintage engagement rings, and custom diamond rings. If you’re looking for an estate Cartier ring, an estate Tiffany ring, a custom french engagement ring (perhaps a Sebastien Barier ring), or a simple estate cocktail ring, 66mint can help. As the best estate jewelry store in San Francisco, and the best online estate jewelry store, 66mint promises to help find you the perfect engagement ring online, or any other online diamond rings you might be searching for. Visit our San Francisco estate jewelry store or shop our online estate jewelry collection to see why our clients consider us the best jewelry store in San Francisco.